package chapter1;

public class Calculation {
	public static void main(String[] args) {
		// 计算圆的面积
		final float PI = 3.14f;
		float r = 2.0f;
		float s = r * r * PI;
		// 控制台输出信息
		System.out.println("圆的面积为:" + s);
	}

}
